EVALUATION OF SURFACE RESIDUAL-STRESSES IN COLD-ROLLED 5083 ALUMINUM-ALLOY BY X-RAY-METHOD

Macroscopic and microscopic residual stresses produced by the cold rol ling in the 5083 aluminum alloy plate were studied by X-ray diffractio n method. The factors concerning the accurate X-ray residual stress me asurement were also investigated experimentally. The results obtained in the present study were as follows: (1) No remarkable variation of t he X-ray elastic constants of the (222) crystal plane were observed an d there was no clear effect of the cold rolling ranging from 10 to 85% reductions in area on the X-ray elastic constants. The elastic consta nt measured by strain gauges correspond to those measured by the X-ray diffraction procedure. (2) According to the results of the integrated intensity of diffraction profile at the specimen surface, no clear ef fect of the reductions in area on the formation of rolling texture was observed. (3) The macroscopic residual stresses in the rolling direct ion showed both tensile and compressive characteristics, and decreased with increasing the reductions in area.